HIGH-PRESSURE SYNTHESIS OF USEFUL COMPLEX SULFIDES

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High-pressure and high-temperature behavior of sulfur, iron sulfide (FeS) and zinc chalcogenide (ZnX ; X=O, S, Se and Te) was investigated by in-situ X-ray observation method and quenching method. Pressure and temperature range for the investigation was up to 16GPa and 1000℃. The melting curve of sulfur under high-pressure condition up to 12GPa was determined, which was important information for synthesis of sulfides under high-pressure condition. Several interesting physical properties of sulfides were also found, compared with oxides. In the case of FeS, a second-order phase transition was found, which may be explained by a spin ordering of iron atoms. A new highpressure phase of ZnSe with the B9 (HgS)-type structure was found as predicted by an ab-initio calculation. On the basis of the melting curve of sulfur and the properties of sulfides, synthesis of several complex sulfides (CaTiS_3, SrTiS_3 and BaTiS_3) was tried under high-pressure and high-temperature conditions.